Thanks in advance for any helping articles in this issue(Dark fermentation)

This is very dependent on the organism you are using. I work with a hyperthermophilic heterotrophic archaea that optimally grows at 82 degrees Celsius. It grows best on tryptone and maltose with a basic salt medium for hydrogen production. There is a great mini-review by Sudhanshu Pawar and Ed W. J. van Niel (2013) on thermophilic biohydrogen production that may be helpful. Goodluck!

Thanks a lot Marie for your answer and good luck  for you too.

many thanks for your reply dear Vamsi

Dear Randa

I hope these articles can help. some of them are about conditions for mixed cultures and the others for pure cultures. here are the links: 

http://www.sciencedirect.com/science/article/pii/S096014811200256X

http://www.sciencedirect.com/science/article/pii/S0360319911025833

http://www.sciencedirect.com/science/article/pii/S0360319912026262

http://www.sciencedirect.com/science/article/pii/S0360319908009397

https://www.researchgate.net/publication/24010800_Process_optimization_of_biological_hydrogen_production_from_molasses_by_a_newly_isolated_Clostridium_butyricum_W5

Article Process Optimization of Biological Hydrogen Production from ...

Dear Randa M. Osman,

Recently, I have published one paper on the optimization of dark fermentation hydrogen production, considering all possible physicochemical parameters. The optimization was performed using statistical and AI approaches.

Article Optimization of dark fermentative hydrogen production from o...